<!DOCTYPE html><html lang=""><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><!--[if IE]><link rel="icon" href="/calc/favicon.ico"><![endif]--><style>* {
            /**
             * 简单粗暴, 一劳永逸的写法
             */
            padding: 0;
            margin: 0;
            font: inherit;
            vertical-align: baseline;
        }

        * {
            /*
             * 这个属性只用于iOS, 当你点击一个链接或者通过Javascript定义的可点击元素的时候
             * 它就会出现一个半透明的灰色背景
            */
            -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
        }

        html {
            -webkit-text-size-adjust: 100%; /* 禁止字体变化 */
        }

        body {
            font-size: 14px;
            font-weight: 400;
            font-family: Helvetica, Arial, sans-serif;
            line-height: 1;
            -webkit-overflow-scrolling: touch; /* 设置滚动容器的滚动效果 */
            -webkit-font-smoothing: antialiased; /* 字体抗锯齿渲染 */
            width: 100vw;
            height: 100vh;
            background-color: #2c3e50;
            color: #f1f1f1;
        }

        a, a:active, a:hover {
            /**
             * 某些浏览器会给 a 设置默认颜色
             */
            color: unset;
            text-decoration: none;
        }

        ol, ul, li {
            /**
             * 去掉列表样式
             */
            list-style: none;
        }

        img {
            border: 0;
            vertical-align: middle
        }

        table {
            /**
             * 去掉 td 与 td 之间的空隙
             */
            border-collapse: collapse;
            border-spacing: 0;
        }

        input, textarea, select {
            outline: none; /*去掉fouce时边框高亮效果*/
            background: unset; /*去掉默认背景*/
            appearance: none;
            -webkit-appearance: none; /* 去除ios输入框阴影 */
        }

        /* 禁止选中文本内容 */
        *:not(input, select, textArea) {
            -webkit-user-select: none;
        }

        .ul {
            width: 100%;
            height: 100%;
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